Podcast
Questions and Answers
What do Threshold Limit Values (TLVs) represent?
What do Threshold Limit Values (TLVs) represent?
- The biennial concentration of substances allowed in the atmosphere
- The annual exposure limit to substances in the atmosphere
- The maximum concentration of substances allowed in the atmosphere (correct)
- The minimum concentration of substances allowed in the atmosphere
Who has the authority to issue a special rule for establishing TLVs for toxic substances not listed in the table?
Who has the authority to issue a special rule for establishing TLVs for toxic substances not listed in the table?
- A technical committee member
- The Director
- The Regional Office (correct)
- The Secretary
How often does the Secretary review or update the Standards on threshold limit values?
How often does the Secretary review or update the Standards on threshold limit values?
- Periodically (correct)
- Annually
- Biennially
- Quarterly
Who are the members of the technical committee that recommends updating the TLVs?
Who are the members of the technical committee that recommends updating the TLVs?
Where are other members of the technical committee drawn from?
Where are other members of the technical committee drawn from?
When do the standards formulated by the technical committee become effective?
When do the standards formulated by the technical committee become effective?
What do threshold limit values refer to in the context of the text?
What do threshold limit values refer to in the context of the text?
In the context of Rule 1072, what does a substance designation 'Skin' imply?
In the context of Rule 1072, what does a substance designation 'Skin' imply?
How should an employee's exposure to materials listed in Table 8a in an 8-hour workshift be limited?
How should an employee's exposure to materials listed in Table 8a in an 8-hour workshift be limited?
What is the purpose of having a 'C' prefix for certain materials in Table 8?
What is the purpose of having a 'C' prefix for certain materials in Table 8?
Study Notes
Occupational Health and Environmental Control
- Rule 1070 establishes threshold limit values for toxic and carcinogenic substances and physical agents in the work environment.
- Threshold limit values represent the airborne concentration of substances that nearly all workers can be exposed to daily without adverse effects.
Threshold Limit Values for Airborne Contaminants
- Threshold limit values refer to time-weighted concentrations for an 8-hour workday and a total of 48 hours of work exposure per week.
- Exposure limits for materials with names preceded by "C" (e.g. Boron triflouride) shall not exceed the ceiling value given in the Table.
Exposure Guidelines
- Exposure to materials not preceded by "C" and materials in Table 8a shall not exceed the 8-hour time-weighted average limit.
- Short-period excursions in TLV values may be allowed, but with specific multipliers:
- from 0 to I concentration by 3 times
- from I to I 0 concentration by 2 times
- from over 10 to 100 concentration by 1 ½ times
- from over 100 to 1000 concentration by 1 ¼ times
Skin Notation
- Substances with "Skin" notation (e.g. DDT-Skin) indicate potential cutaneous absorption and require measures to prevent skin absorption.
Compliance Measures
- Administrative or engineering controls should be implemented to achieve compliance with Rule 1072.
- When controls are not feasible, protective equipment or other measures shall be used to keep employee exposure within the prescribed limits.
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Description
Test your knowledge about Rule 1070 which establishes threshold limit values for toxic and carcinogenic substances in the work environment. Learn about airborne concentration of substances and conditions under which workers can be exposed without adverse effects.
